<?php
/**
 ***** 扶摇而上、抱守本真 ******
 * @author Dana
 * @Date 2021/6/7
 */

$var = 3;

echo "Result: ".$var + 3;
echo "\n";
echo "Result: ".($var + 3);
echo "\n";

$arr = array('test'=>null,'test1' => 1,'test2'=>'sisi','test3'=>true,'test4'=>'','test5'=>['alls'=>[]],'test6'=>'0');

echo http_build_query($arr);

var_dump(1...9);

$bool = true && false;

var_dump($bool);

$bool = true and false;

var_dump($bool);